upgrading the exhaust vent window 'exit'

new way of exiting the hot exhaust pipe from the kiln

Many years ago (15, more or less) when I bought my new kiln, I added the "enviro-vent" to the base of the kiln, and vented the kiln, via a rigid 4" metal pipe, to the outside of the studio.   At the time, and with my limited skills in construction (but fertile imagination as to how something might be), I fashioned a way of taking the exhaust pipe out through an adjacent window without having to break any glass, or do too much fussing.  I opened the window, and then inserted a 2" piece of rigid foam insulation, into which a 4" hole had been cut, at the bottom edge.  Then I put the pipe through this hole, and voilà!  The pipe exited the building without much fuss----with the pipe essentially rested on the wooden window sill.  As time passed, however, and as I changed out the rigid pipe for a flexible pipe this last year, I felt, more and more, that the temperature of the pipe was fairly hot, and that my method of construction wasn't the best. I also knew that wood, exposed to high heat over time, undergoes a change, and eventually has a lower flash point for catching fire.  SO, about 2 weeks ago, during one of our increasingly hot spells, and as I was starting the last kiln, I convinced Bruce to help me put in a safer exit hole for the exhaust pipe.  He found a collar from one of our woodstoves (we used to heat both the house and studio with them) which wasn't being used, and which was large enough for the piping to pass through.  Then we took off the (black) plastic from the outside of the window, and the styrofoam from the inside, shut the window, and removed a pane of glass.  On both the outside and the inside of the window, just slightly larger than the pane of glass, he put two pieces of plywood, into which a hole had been cut, large enough for the insulated stove collar to fit. Now the hot piping no longer touches either the wooden sill, or the styrofoam.  When winter comes, and I need to cover the window, again, I'll be making more changes........